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How long does it take for drugs to leave someone's system?

I'm NOT on drugs lol! The only two drugs I even know about are weed and meth because that's what's so popular around here. I was just wondering how long it takes for an average person to get them out of their system. Anyone know?

Alcohol - 3-5 days in urine (eTg), up to 90 in hair and around 10 - 12 hours in blood.
Amphetamines - 1 to 3 days in urine, up to 90 in hair and around 12 hours in blood.
MDMA (Ecstasy) 3-4 days in urine, up to 90 in hair and 1 - 2 days in blood.
Barbiturates - 2 to 4 days in urine, up to 90 in hair and 1 to 2 days in blood.
Phenobarbital - 2 to 3 weeks in urine, up to 90 in hair and up to a week in blood.
Benzodiazapines - 3 to 6 weeks in urine, up to 90 in hair and 2 - 3 days in blood.
Marijuana - 7 to 30 days in urine, up to 90 days in hair, two weeks in blood.
Methamphetamine (crystal) - 3 to 6 days in urine, up 90 in hair, 24 - 72 hours in blood.
Cocaine - 3 to 4 days in urine, up to 90 days in hair, 1 - 2 days in blood.
Codeine - 1 day in urine, up to 90 days in hair, 12 hours in blood.
Fentanyl - 1 day in urine, up to 90 days in hair, 4 hours in blood.
Morphine - 2 -3 days in urine, up to 90 in hair, 6 - 8 hour

One time I went to a Steve Miller concert with my in-laws and husband. The hall was full of old hippies and there was pot smoking EVERYWHERE. A week later my husband had to go for a drug test for a new job and he came up with a faint positive for marijuana...lol. Once he explained who we had seen in concert, the guys just laughed and he got the job.

Glamourina has it pretty much covered but there are a few things that will affect the length.A bad liver and your kidneys too.Drinking lots of water will flush your system out quicker but but the hair test isn't affected by a ware flush.Damn Glamourina...you go girl!!! : )

lol I guess she answered that I always went with ( I had a couple crazy years ) with 30 days for pot and 72 hours for meth ,coc, and amph. , with an extra say to be safe thats blood and urine test thank god that is behind me lol I dunno about hair though ? I always heard that they check any hair on your body and go back like a couple of years ?